package com.zhoukx.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * 说明
 *    SimpleChannelInboundHandler  是 ChannelInboundHandlerAdapter
 *    HttpObject 客户端和服务器端相互通讯的数据被封装成HttpObject
 *
 */
public class MyHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    /**
     * 读取客户端数据
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        if (msg instanceof HttpRequest) {

            System.out.println("piepline hashcode" + ctx.pipeline().hashCode() + " TestHttpServerHandler hash ="+this.hashCode());

            System.out.println("msg 类型 ="+ctx.getClass());

            System.out.println("客户端地址:" +ctx.channel().remoteAddress());

            //获取到    两次请求处理
            HttpRequest request = (HttpRequest) msg;

            URI uri = new URI(request.uri());

            if ("/favicon.ico".equals(uri.getPath())) {
                System.out.println("请求了 favicon.ico,不做响应");

                return;
            }

            // 回复消息给浏览器  Http协议
            ByteBuf buf = Unpooled.copiedBuffer("hello ,我是服务器", CharsetUtil.UTF_8);

            // 构造一个http的响应,即httpresponse
            DefaultFullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf);

            //
            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,buf.readableBytes());

            //将构建好response返回
            ctx.writeAndFlush(response);
        }
    }
}
